#include <stdio.h>
#include <unistd.h>

int main()
{
    pid_t id=fork();
    if(id<0)
    {
        //创建失败
        perror("fork");
        return 1;
    }
    else if(id==0)
    {
        //child process
        while(1)
        {
            printf("I am child, pid:%d, ppid:%d\n",getpid(),getppid());
            sleep(1);
        }
    }
    else
    {
        //parent process
        while(1)
        {
            printf("I am father, pid:%d, ppid:%d\n",getpid(),getppid());
            sleep(1);
        }   
    }
    printf("you can see me\n");
    sleep(1);//进程退出顺序不一样
    return 0;
}
